Genuinely live · measured
Atmospheric CO₂ Now
LIVE
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The most recent daily atmospheric CO₂ reading from the Mauna Loa Observatory in parts per million — the single most-watched number in climate science.
About this number
This is a live, measured figure, read from NOAA — Mauna Loa— the same feed that powers the live map behind it. If that feed goes quiet, this counter says so rather than freezing on an old value: a frozen pulse is a lie.